Palynology of the Permo-Triassic boundary in borehole mityaha-1 southwest Mosul city-Iraq

Abstract EN

Twelve samples from the peromo-Triassic succession in borehole Mityaha-1 are studied paly nolo gic ally.

They yielded well preserved and diversified palynomorphs.

One hundred twenty five species related seventy nine genera are identified.

Three assemblage zones (A-C) are established, representing two contrasting environments Assemblage zone A is of Late Permain age, while assemblage zones B and C are of an Early Traissic age.

Assemblage zone A is rich in spores with a relict of Carboniferous elements.

A phenomena usually observed in Cathaysian botanical provinces.

The non-taeniate disaccate pollen grains were the dominant group in assemblage zone B.

The studied microflora was greatly influenced by the Euroamericart, Gondwanan elements and of lesser amounts by that of the Angaran elements.

The suggested Permo-Triassic boundary is raised about fifty meters which are added CO.the previously determined Permian sequence.

The botanical affinity of the quantitatively important genera were discussed in an attempt to get a clear picture about the palaeovegetation which greatly helped in reconstructing the palaeoecological model.